40+ Design Types Of Er Model Example Download Zip Pics. A standard form of use case diagram is defined in the unified modeling language as shown in the use case diagram. Example company database er model concepts er diagram problems with er models alternative diagrammatic notations.
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• entities (and their entity types and entity sets). Refined into a relationship if attribute is a reference to another entity type. Conceptual schema (in the model of a specific dbms) physical design internal schema (in homephone=null degree={b.s., m.s., ph.d.} (multivalued attribute). Design choice for er conceptual model it is very difficult to determine if a particular concept must be represented as entity type or attribute or 52.